Standards ASTM G61 - used for Cyclic Potentiodynamic Polarization measurements, and G150 - used in Critical Pitting Temperature measurements, are commonly used to determine the susceptibility of corrosion resistant alloys to localized corrosion. The two methodologies utilize different, yet related, driving forces applicable to the process, namely the potential and temperature. This study sought to establish the relationship between the pitting potential from ASTM G61 and critical pitting temperature from ASTM G150, both of which are determined as the driving force, potential or temperature, is on the increase. ASTM G61 also establishes the repassivation potential as the potential is decreased. In this study, ASTM G150 is extended to define the repassivation temperature for a decreasing temperature. The “unified” approach was utilized to identify the transition of a material from passive to active and its return to passive. Laboratory experiments were performed with UNS S32205 in a solution of sodium chloride.

Subject
Electric current, Test methods, Pitting temperature, Repassivation, Repassivation potentials, Constants, Pitting, Construction, Localized corrosion, Critical pitting potential, Line current, Corrosion potential, Electrode potential
Keywords:
UNS S32205, Pitting Potential, Pitting Temperature, Repassivation Potential, Repassivation Temperature
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2021
Association for Materials Protection and Performance (AMPP)
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